The customTag attribute is invalid

[Libpzzz]

const converterOptions = {
customTag: (format, deltaOp) => {
console.log(format, deltaOp,"format, deltaOp");
return null; // 使用默认标签
}
};
let quillToHtml = new QuillDeltaToHtmlConverter(values.ops, converterOptions);
let htmlString = quillToHtml.convert();
After writing like this, no content was output